Ball point pen



V. H. LUST BALL POINT PEN April 4, 1950 Filed Jan. 10, 1947 [TV m.

INVENTOR VaZZizz AKZZ YZ.

ATTORNEY Patented Apr. 4, 1950 UNITED STATES PATENT OFFICE BALL POINT PEN Valtin H. Lust, Sloatsburg, N. Y.

Application January 10, 1947, Serial No. 721,170

2 Claims. (01. 120-424) This invention is an improvement in pens enclosing a reservoir to carry writing fluid and having a spherical writing element of very small size at the end thereof.

An important object of the invention is to provide a pen of this type with means for ensuring a steady flow of the writing fluid, so that the pen will miss no strokes and every mark inscribed therewith will be uniform and distinct in appearance; the construction of the pen being comparatively simple and inexpensive and comprising relatively few parts that can easily be assembled as required.

A further object is to provide a ball-point pen of such design that, when the ink or other writing fluid is exhausted the reservoir can easily be recharged or replaced with a new one if neces sary.

Another object is to provide a ball-point pen having a pressure member which constantly engages the reservoir to produce an even discharge of the contents.

Other objects and the nature and advantages of the invention are clearly set forth in the ensuing specification and the novel features are defined in the appended claims. But this disclosure is by way of example only, and in practice changes may be made in size, shape and arrangement of parts without altering the essential structure in which the invention resides.

On the drawing:

Figure l is a longitudinal sectional view of a modified form of the invention.

Figure 2 is a top view of a part of said modified form.

Figure 3 is a section on line 3-3 of Figure 1.

Figure 4 is a longitudinal section of a modification.

The numeral 5 indicates the forward terminal section or member of the pen and 2 a piece of tubing connected to the member I, at one extremity thereof. The terminal member I has a longitudinal duct 3 extending through it and at the front end of the member l is mounted a conical tip having a reduced shouldered neck 5, that is inserted into the duct 3. The ball 6 is received in the end of the tip E, and this tip has a socket which seats the ball 6 and retains it in place but permits it to revolve freely. As usual, the ball fits the socket loosely, and is secured therein. by squeezing the edge of the socket enough to keep the ball from falling out.

To the inner end of the member I is connected a compressible bulb or sack i, which receives the writing fiuid and serves as the reservoir thereof. The section has a screw threaded portion 8, so that it may be inserted into a conical outer sleeve which envelopes the member I and adjacent end of the tubular part 2 up to the tip 4. This outer conical sleeve is not shown but it unites with the usual outer casing which receives the sleeve 2 and envelopes the latter over its entire length.

The bulb or sack 1 is closed at one end and open at the other, which is slipped upon the inner extremity 9 of the member I. This extremity constitutes a head at the base of which is a groove [0, and into this groove fitsthe taut edge of the open end of the sack l which is preferably of rubber, and stretches nicely. The sack of course will yield and can readily be pulled off for replacement.

In practice the reservoir is filled with a suitable writing ink, usually somewhat thick and viscous, so that it will not easily evaporate. It flows down into the member I, passes through the duct 3 into the socket for the ball 6, and covers the surface of the ball, which transfers itto the surface against which the pen is stressed. The feed of the ink to the tip is assured by means of a single presser member having the shape of an elongated leaf spring M. This member engages one side of the bulb over most of its length. The inner end lies near the head [0 and the outer end i8 is bent over and engages the inner end of a notch H! in the adjacent extremity of the sleeve 2. The latter has a longitudinal slot 29 adjacent the member l1 and in line with the notch l8 and in this slot is a sliding adjuster 2! having one end 22 downturned and enlarged to press against the member 11. Near the notch Hi the spring has a portion bowed inward but elsewhere it is fiat. The front end of the slide 23 is also turned in to fit the slot 20. Hence, as the ink is consumed, the slide is moved forward by hand to keep the sack under some pressure to feed to the ball 6. The outer casing is of course removed from time to time to expose the slide 2!, or it can also be slotted.

In the pen of Figure 4, the spring member shown at 25 is not bowed, but bent away from the slot 20, and its end l8 fits into a notch l9 on the side of the sleeve 2 opposite the slot 2!].

The parts of the members i! and 24 which are bent adjacent the recess 18 are elastic and serve the same purpose as the arms l3. The invention is thus well adapted to serve its intended purpose.

Having described my invention, what I believe to be new is:

1. A ball point pen having a forward section, a

ball-carrying tip in one extremity thereof, a compressible sack connected to the other extremity, a sleeve enveloping the sack and mounted on the head, a presser member in the sleeve engaging the sack, said member having a resilient bent portion at one end connected to the sleeve and extending along same, the latter having a slot, and a sliding element in the slot having a downturned end to engage said member and to force said member against the sack.

2. The pen according to claim 1, wherein said bent portion is connected to the sleeve in line with said slot.

VALTIN H. LUST.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,381,332 Qualmann June 14, 1921 1,808,377 Reichenbach June 2, 1931 1,853,652 Allinson Apr. 12, 1932 2,064,111 Hartland Dec. 15, 1936 2,427,068 Randolph Sept. 9, 1947 2,432,061 Chesler Dec. 2, 1947 

